Production of urea-ammonium sulfate suspension fertilizer

ABSTRACT

A process for production of highly concentrated nitrogen sulfur suspension fertilizers, with excellent long-term storage and handling properties, from ammonia, sulfuric acid, and urea. Satisfactory operation of the process and production of high-quality suspensions requires the use of a novel cooling procedure. For prevention of scale formation and production of small crystals, the product is cooled in two or more stages with gelling type clay added prior to or during crystallization and with air cooling used in the cooling stage(s) involving crystallization.



